Functional Description
Microsemi Proprietary and Confidential UG0677 User Guide Revision 9.0 21
The ERM manages the re-establishment of a link after a break or disruption. A restart begins when a
valid data stream is re-applied to the receiver inputs. This starts the operation of the ERM to
systematically control the CDR to re-initialize the link. As shown in following figure, the ERM properly re-
establishes a CDR fine lock after assuring the link is stable. When the link polling is complete, the ERM
transitions the transceiver back to proper operation. This is completed without changing any of the CDR
or DFE calibration settings and returns calibration setting to those used prior to the disruption or break in
the serial data stream.
Figure 14 • Restart after Initialization
Note: RX_IDLE integrator detects threshold for signal-presence.
The user also can optionally invoke a calibration on-demand. This would be needed if the interconnection
is changed such as swapping cables or other interface media. In this case, the user can request
calibration only after a valid data stream is applied to the RXD inputs. As shown in following figure,
assertion of the LANE#_CALIB_REQ initiates the ERM to invoke a CDR/DFE calibration during which
the CDR remains LOCK2DATA. The LANE#_CALIB_REQ is required to stay asserted by the user logic
until LANE#_CALIBRATING goes high.
LTR
Glitches on RX_IDLE is expected for incoming traffic > 5Gbps
LANE#_RXD[P-N]
LANE#_RX_IDLE
CDR Status(Internal)
LANE#_CALIBRATING
LANE#_RX_VAL
LTR= Lock to Reference clock
LTD= Lock to Data
LTD
See note
LANE#_RX_READY_CDR
LANE#_RX_READY
(Rx Fine Lock)
LANE#_LOS
Do Not Care
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